What's the title and singer of the song with the line "it's getting dark for the second time since we got up"?

I heard the song on Pandora the other day, but I forgot the title and who sings it. This is the only line I remember, and when I Googled it, I only got one hit and it didn't mention either. The song was sung by a little girl (at least, the version I'm thinking of, if there are multiple), and it was about a jig or something. If anyone could help me out, I'd really appreciate it because it's bothering me something awful.